Satellite Transceiver Breakout - Swarm M138 - Hookup Guide

This Tutorial is Retired!

This tutorial has been retired; the satellite service for this product will be terminated at the end of December 2024.

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Contributors: PaulZC
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Hardware Assembly

Assembling the M138 modem onto the Breakout is very easy:

  • Remove the two M2.5 screws from the standoffs
  • Align the slot of the modem's mPCIe connection with the key of the Breakout connector
  • Insert the modem at an angle into the connector
  • The modem will stick up at a shallow angle
  • Gently hold the modem down and secure with the two M2.5 screws

You can connect the Swarm and GNSS antennas directly to the modem:

Pictured are the two u dot F L antennas

Or you may prefer to use the supplied u.FL cables to connect via the robust SMA connectors:

Pictured are the two u dot F L cables

Either way, you may find it useful to read this tutorial first:

Three Quick Tips About Using U.FL

Quick tips regarding how to connect, protect, and disconnect U.FL connectors.

The Swarm antenna requires a ground plane for correct operation. That's why we included one in the box! Pass the female SMA connector through the hole in the ground plane and secure with the shakeproof washer and nut. Screw the Swarm antenna on top.

Pictured are the Swarm antenna and ground plane

Pictured are the ground plane dimensions

Having a hard time seeing? Click the image for a closer look.

The ground plane has both grounded holes (holes with exposed tinned copper surround and through-hole plate) and plain through-holes (isolated). This allows you to connect the ground plane to any surrounding metalwork, or not, depending on your needs.

For best results, place the VHF antenna and ground plane at least 1m above the ground, or any solid surfaces.

The exposed finish is standard lead-free Hot Air Solder Levelled (HASL) plating. It will tarnish over time. You may wish to lacquer the board, with standard automotive spray lacquer, for longevity.

If you are using your own cables, check the SMA connector polarity. The Swarm antenna is standard polarity, not "RP" (Reverse Polarity):

Antenna with standard polarity SMA

Both antennas need to be located outdoors, with a clear view of the sky. But the modem and breakout board are not weatherproof. Depending on how you are going to weatherproof the boards, and where they are going to be mounted, you may find additional extension cables or GNSS antennas useful.
GPS/GNSS Magnetic Mount Antenna - 3m (SMA)

GPS/GNSS Magnetic Mount Antenna - 3m (SMA)

GPS-14986
$13.95
3
Interface Cable - SMA Female to SMA Male (25cm)

Interface Cable - SMA Female to SMA Male (25cm)

WRL-12861
$5.50
1
Magnetic Mount SMA - 2m

Magnetic Mount SMA - 2m

GPS-19576
$24.95

SMA Male to SMA Female - 10m (RG174)

CAB-17495
Retired